Bug 941249 : home page donation banner, l10n fixes
* reuse the same string for Support Mozilla using a striptags filter to avoid asking twice the translation to localizers
* display currency according to German, French, Brazilian conventions, especially important for pt-BR since $ means reales and not dollars there!
Merge pull request #1446 from pascalchevrel/Bug-941249-donation_banner_home_l10n_fixes

Bug 941249 : home page donation banner, l10n fixes